You will enjoy a 9600. It is reliable, cheap to maintain, and comfortable. It will disappoint you in heavy barley, but it will keep chugging when everything else has gone home. Things to look for on used onesIJ Check out the straw walker bearings. Give the walkers themselves a shove and see how much play is in the bearings. 9600s before 1995 or so had wood blocks. 1995 and up had metal bearings. Deere paid for a changeup to hardened cranks and better metal bearings when the new steel bearings and soft cranks started wearing out before the old wood ones used to. If you have the time, have a coolant scan done on the antifreeze. It is cheap and will tell you if the engine is cooked. The 8.1 is pretty tough, but it pays to check. look for one with new rasp bars and a newer concave. Check for bolted on slats on the feederhouse chain. New ones are riveted on with Deere's so any ones bolted on there indicates that one has bent or been broken. Make sure the clean grain and tailings conveyers aren't worn out. Have a look at the augers underneath the concave that move the grain and chaff back to the shoe. Make sure the bearings aren't shot, the flighting isn't done, and the troughs aren't wearing through. If the unit is a '96 or'97, have a look at the belt tension arm for the straw chopper. lots of those models had fine cut choppers on them which put a big load on the jackshaft. lots of the units have cracked the sides of the combines where the jackshaft attaches. Deere made a brace available, so make sure it has it. '97s did have some low power issues. Something to do with a hot fuel derate. I think 1995 or 1996 is probably the best in terms of year, although you do get the fancy 50 year anniversary decal on the '97
! I don't know what years are involved, but there is a shaft than runs across the combine underneath the grain tank, in behind the cab that has a plastic shield around it. It is really tough to get to, in fact a lot of folks don't know it is there. Over time that shield packs full of dust and chaff. If not blown out from time to time, it can start a fire. Other than that, just look for sheet metal damage, wear on the grain tank augers etc. Can't think of anything else off the top of my head. Overall, they are great combines. Good luck in your search.